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RISS 인기검색어
- 검색키워드
- 저자 : Gholamreza Nouri (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
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Experimental and numerical analyses of perforated corrugated steel shear walls
Gholamreza Nouri,Arash Rayegani,Fariba Nemati,Gholam Hossein Eftekhar 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.12
This study presents an evaluation of the seismic performance of corrugated steel shear walls (CSSWs) with openings. Cyclic experimental tests were conducted on CSSW specimens featuring square and circular openings, with a comparison made to infill CSSWs. Additionally, numerical analysis was performed to investigate various opening configurations. The results indicate that CSSWs with openings experienced a maximum strength reduction of approximately 10% when compared to infill walls. Furthermore, placing the opening at the center of the wall resulted in an elastic stiffness decrease of approximately 23%. The presence of openings also mitigated the pinching effect observed in cyclic responses. The numerical analysis further revealed that incorporating stiffeners around the openings significantly enhanced the seismic performance of CSSWs. Stiffened openings demonstrated improvements of approximately 38% in ultimate strength, 26% in stiffness, 25% in ductility reduction factor, and 15% in equivalent viscous damping ratio when compared to unstiffened openings. To further investigate the practical application, the study numerically evaluated 3-story frames with perforated CSSWs under monotonic loading. The analysis demonstrated the beneficial impact of opening stiffeners, as stiffened openings exhibited increased ductility, loading capacity, initial stiffness, and response behavior factor of approximately 13.5%, 9.0%, 20.5%, and 30%, respectively, when compared to unstiffened perforated CSSWs. Overall, this study contributes to the understanding of the seismic behavior of CSSWs with openings and highlights the advantages of incorporating stiffeners around the openings to enhance their structural performance.
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Spectral analysis of dynamic response of a thin beam subjected to a varying speed moving mass
Morteza Tahmasebi Yamchelou,Gholamreza Nouri 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.7
A parametric survey was conducted to capture the dynamic response of a thin beam subjected to a varying speed moving mass. The existing literature lacks a comprehensive study on the beam dynamic behavior under a varying speed moving mass with arbitrary constant acceleration and mass ratio. The current work represents midpoint response spectra for a thin beam acted upon by a varying speed moving mass for a wide range of design parameters. Findings show that for a given mass ratio, higher response amplitudes are observed in decelerating motion compared to accelerating one. Moreover, increasing the mass ratio of the moving mass generally leads to higher beam dynamic response. Among the methods that can be utilized to calculate beam response, the Eigenfunction expansion method (EFM) and Orthonormal polynomial series expansion method (OPSEM) were used. Then an improvement technique was applied on both aforementioned methods and computational efficiency and convergence rate of all utilized methods was compared.
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